php中怎么在外部修改类的私有或受保护属性值
在做单元测试框架时，发现了个比较郁闷的问题：测试人员需要在类外修改类的private或protected成员变量的值，而这些变量没有抽象成public的属性，同时为了代码量的问题，也不可能修改要测试的类。怎么在类外修改类的私有变量呢？请看下面的关键代码：
类文件sellAction.php， 内容如下：
<?php class SellAction{
protected $cUid;
private $id;
public $pId;
public function output(){
echo "output protected cUid :".$this->cUid;
echo "<br>";
echo "output private id :".$this->id;
echo "<br>";
echo "output public pId:".$this->pId;
echo "<br>";
}
}
<?php require "sellAction.php";
function initReferenceAttr(& $reference, $arr)
{
if(!is_object($reference))
{
throw new Exception('reference must be object');
}
if(!is_array($arr))
{
throw new Exception('arr must be array');
}
$cls = get_class($reference);
$reflectCls = new ReflectionClass ($cls);
foreach($arr as $key => $val)
{
$pro = $reflectCls->getProperty($key);
if($pro && ($pro->isPrivate() || $pro->isProtected())){
$pro->setAccessible(true);
$pro->setValue($reference, $val);
}else{
$reference->$key = $val;
}
}
return true;
}
$act = new SellAction();
echo "not set private protect public var";
echo "<br>";
var_dump($act);
$act->output();
$attr = array('cUid'=>'234556', 'pId'=>'987676757', 'id'=> '782100');
initReferenceAttr($act, $attr);
echo "<br>";
print_r($attr);
echo "<br>";
echo "<br>";
echo "set private protect public var ";
echo "<br>";
var_dump($act);
echo "<br>";
$act->output();在浏览器中，直接浏览test.php，内容大致如下：
not set private protect public var
object(SellAction)#1 (3) { ["cUid":protected]=> NULL ["id":"SellAction":private]=> NULL ["pId"]=> NULL } output protected cUid :
output private id :
output public pId:
Array ( [cUid] => 234556 [pId] => 987676757 [id] => 782100 )
set private protect public var
object(SellAction)#1 (3) { ["cUid":protected]=> string(6) "234556" ["id":"SellAction":private]=> string(6) "782100" ["pId"]=> string(9) "987676757" }
output protected cUid :234556
output private id :782100
output public pId:987676757上面的demo主要是通过反射实现该功能。反射功能需要php版本>=5.3，反射的相关信息请参阅：http://php.net/manual/en/book.reflection.php
